Dept. of Labor, Division of Labor Market and Demographic Research, Office of Occupational and Demographic Research(Trenton, N.J. : Dept. of Labor, Division of Labor Market and Demographic Research, Office of Occupational and Demographic Research, 1993)
Dept. of Labor, Division of Labor Market and Demographic Research, Office of Occupational and Demographic Research; Wu, Sen-Yuan Dr.(Dept. of Labor, Division of Labor Market and Demographic Research, Office of Occupational and Demographic Research, 1993-09)